COMPRESSIVE STRENGTH OF SHIP HULL GIRDERS. PART II. STIFFENED PLATES

This is Part II of a two-part report on a year of investigation into the compressive strength of ship hull girders. This part covers stiffened mild steel plates with a/b equal 3 and b/t equal 50. Seven tests were conducted on panels and grillages loaded in axial compression in various combinations with transverse membrane compression and normal pressure. In addition, a three-girder was tested in pure bending. One of the prime goals of the project was to determine the strength of plates in grillages and girders as compared to the square tube behavior described in Part I. From an engineering viewpoint there was little difference between the square tube strengths and the strengths of plates in the stiffener-plate configurations. The results revealed an increase in plate strength of 4-1/2 percent compared to the tube test data for uniaxial compression loading without normal pressure, and a reduction of 1 percent when tested in uniaxial compression plus normal pressure. The girder strength was 3.7 percent above the tube strength. The effect of biaxiality may have reduced the longitudinal strengths of the grillages compared to the tube data. However, the reduction could have been a few percent at most. A single panel in uniaxial compression was 7.1 percent stronger than the corresponding tube. All the studies in this phase were performed on electron-beam-welded plate assemblies of which a 0.030 inch thick mild steel plate was the basic element. The plates between stiffeners were 1.50 inches wide (b/t equal 50) and 4.50 inches long (a/b equal 3). These nominal dimensions are the same as the plates which comprised the faces of the tubes for b/t equal 50 which were tested during the Part I investigation. The stiffeners were designed to insure achievement of maximum plate strength. Strain data were recorded to check stress distributions for general uniformity.

  • Corporate Authors:

    Sanders Associates, Incorporated

    Daniel Webster Highway, South
    Nashua, NH  USA  03060
  • Authors:
    • BECKER, H
    • Colao, A
    • Goldman, R
    • Pozerycki, J
  • Publication Date: 1971

Media Info

  • Features: Appendices; Figures; References;
  • Pagination: 23 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00028778
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: SSC-223 Final Rpt
  • Contract Numbers: N00024-69-C-5413
  • Files: TRIS
  • Created Date: Apr 10 1972 12:00AM